django e-commerce logic

I've been looking around for django commerce sollutions for a while
and they all seem to work with predefined database models. For
instance, you always have a name field and a slug field that come with
the product. While this could seem fine if you are creating a store
form scratch, it makes it very uncomfortable if you already have a
model structure on a site and you just want to start selling one of
your models.

What I would feel more comfortable is to add a commerce layer to the
site and tell this layer how to obtain the product information, client
information, etc, or fallback to provided defaults, so it can fit in
any existing project without having to run data migrations of any
kind.

Do you know any django commerce that works like this?

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